An individual with achlorhydria (lack of or low gastric acid in stomach) may have abdominal pain due to difficulty digesting food, loose bowel movements & problems due to poor absorption of nutrients.
Foods for Good Digestion # 8: Cod liver oil. Cod liver oil is loaded with vitamin A and vitamin D. The presence of these vitamins is essential to keep the digestive tract healthy and also prevents in the development of various digestive problems in the GI tract.
A diet rich in fibre can help digestion and prevent constipation. Aim for the recommended dietary intake of 30g of fibre a day. For a healthy bowel, you need fibre from a variety of sources, such as wholemeal bread, brown rice, fruit and veg, beans and oats.